We have been having a strange issue, whereby OSPF stops updating properly.
We can see an entry for an ip route in the database but it is not in the
kernel routing table, and when it is the DR, other routers then do not have
the route at all.
We are seeing this across multiple boxes. We have 10+ ospf speakers, and
seem to see the issue at different times.
The problem starts with:
ospfd[6960]: recv_db_description: neighbor ID x.x.x.x: seq num mismatch,
bad flags
ospfd[30114]: lsa_check: bad age
And these just then continue, until we restart ospfd, and the problem
appears to go away.
We are running some old routers on 5.8 and some new on 6.4. We appreciate
that we need to upgrade the 5.8 routers but we are keen to stabalise things
first.
Having looked at the source, we can see the line generating the message:
case NBR_STA_FULL:
if (dd_hdr.bits & OSPF_DBD_I ||
!(dd_hdr.bits & OSPF_DBD_MS) == !nbr->dd_master) {
log_warnx("recv_db_description: neighbor ID %s: "......
Could anyone explain the scenario in which this would be expected, so we
can see how to resolve the issue.
We run some of our routers under VMware, could some sort of OS pause cause
this?
Thanks
Richard
